A5029915108- Pulsars and Gravitational Waves Research
- Geophysics and Sensor Technology
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Adaptive optics and wavefront sensing
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Geophysics and Gravity Measurements
- Experimental and Theoretical Physics Studies
- Astrophysical Phenomena and Observations
- Atomic and Subatomic Physics Research
- Advanced Measurement and Metrology Techniques
- Photonic and Optical Devices
- Seismic Waves and Analysis
- Relativity and Gravitational Theory
- Advanced Optical Sensing Technologies
- Magnetic confinement fusion research
- Quantum optics and atomic interactions
- Radio Astronomy Observations and Technology
- Semiconductor Lasers and Optical Devices
- Orbital Angular Momentum in Optics
- Meteorological Phenomena and Simulations
- Numerical methods for differential equations
- Model Reduction and Neural Networks
- Computational Physics and Python Applications
The University of Adelaide
2019-2025
ARC Centre of Excellence for Gravitational Wave Discovery
2019-2023
Australian Research Council
2019-2023
University of Birmingham
2013-2018
We present a single-source dual atom interferometer and utilize it as gradiometer for precise gravitational measurements. The macroscopic separation between interfering atomic wave packets (as large 16 cm) reveals the interplay of recoil effects curvature from nearby Pb source mass. baseline is set by laser wavelength pulse timings, which can be measured to high precision. Using long drift time momentum transfer optics, reaches resolution $3 \times 10^{-9}$ s$^{-2}$ per shot measures 1 rad...
Atom interferometers employing optical cavities to enhance the beam splitter pulses promise significant advances in science and technology, notably for future gravitational wave detectors. Long cavities, on scale of hundreds meters, have been proposed experiments aiming observe waves with frequencies below 1 Hz, where laser interferometers, such as LIGO, poor sensitivity. Alternatively, short also enhancing sensitivity more portable atom interferometers. We explore fundamental limitations...
The Einstein Telescope (ET) is a proposed future gravitational wave detector. Its design original, using triangular orientation of three detectors and xylophone configuration, splitting each detector into one high-frequency low-frequency system. In other aspects the current retains dual-recycled Michelson interferometer typical detectors, such as Advanced LIGO. this paper, we investigate feasibility replacing part ET with Sagnac interferometer. We show that interferometer, realistic optical...
Pykat is a Python package which extends the popular optical interferometer modelling software Finesse. It provides more modern and efficient user interface for conducting complex numerical simulations, as well enabling use of Python's extensive scientific ecosystem. In this paper we highlight relationship between Finesse, how it used, provide an illustrative example has helped to better understand characteristics current generation gravitational wave interferometers.
Finesse is a fast interferometer simulation program. For given optical setup, it computes the light field amplitudes at every point in assuming steady state. To do so, description translated into set of linear equations that are solved numerically. convenience, number standard analyses can be performed automatically by program, namely computing modulation-demodulation error signals, transfer functions, shot-noise-limited sensitivities, and beam shapes. perform analysis using plane-wave...
We demonstrate the applicability of EPR entanglement squeezing scheme for enhancing shot-noise-limited sensitivity a detuned dual-recycled Michelson interferometers. In particular, this is applied to GEO\,600 interferometer. The effect losses throughout interferometer, arm length asymmetries, and imperfect separation signal idler beams are considered.
With significantly improved sensitivity, the Einstein Telescope (ET), along with other upcoming gravitational wave detectors, will mark beginning of precision astronomy. However, pursuit surpassing current detector capabilities requires careful consideration technical constraints inherent in existing designs. The significant improvement ET lies low-frequency range, where it anticipates a one million-fold increase sensitivity compared to detectors. Angular control noise is primary limitation...
Proposed near-future upgrades of the current advanced interferometric gravitational wave detectors include usage frequency dependent squeezed light to reduce sensitivity-limiting quantum noise. We quantify and describe degradation effects that spatial mode-mismatches between optical resonators have on field. These can first order be described by scattering into second-order Gaussian modes. As a demonstration principle, we also show squeezing Hermite-Gaussian modes ${\mathrm{HG}}_{02}$...
Near-unstable cavities have been proposed as an enabling technology for future gravitational wave detectors, their compact structure and large beam spots can reduce the coating thermal noise of interferometer. We present a tabletop experiment investigating behaviour optical cavity it is parametrically pushed to geometrical instability. report on observed degeneracies cavity's eigenmodes becomes unstable resonance conditions become hyper-sensitive mirror surface imperfections. A simple model...
Laser interferometers with high circulating power and suspended optics, such as the LIGO gravitational wave detectors, experience an optomechanical coupling effect known a parametric instability: runaway excitation of mechanical resonance in mirror driven by optical field. This can saturate interferometer sensing control systems limit observation time detector. Current mitigation techniques at sites are successfully suppressing all observed instabilities, focus on behaviour instabilities...
We propose a new optical configuration for an interferometric gravitational wave detector based on the speedmeter concept using sloshing cavity. Speedmeters provide inherently better quantum-noise limited sensitivity at low frequencies than currently used Michelson interferometers. show that practical cavity can be added relatively simply to existing dual-recycled interferometer such as Advanced LIGO.
Near-unstable cavities have been proposed as an enabling technology for future gravitational wave detectors, their compact structure and large beam spot can reduce the thermal noise floor of interferometer. These operate close to edge geometrical stability, may be driven into instability via small cavity length perturbations or mirror surface distortions. They are at risk suffering from problems such high optical scattering loss Gaussian mode degeneracy. The well-defined beams also distorted...
Gravitational-wave observatories around the world are searching for continuous waves: persistent signals from sources such as spinning neutron stars. These searches use sophisticated statistical techniques to look weak in noisy data. In this paper, we demonstrate these using a table-top model gravitational-wave detector: Michelson interferometer where sound is used an analog gravitational waves. Using signal processing continuous-wave searches, recovery of tones with constant and wandering...
\textsc{Pykat} is a Python package which extends the popular optical interferometer modelling software \textsc{Finesse}. It provides more modern and efficient user interface for conducting complex numerical simulations, as well enabling use of Python's extensive scientific ecosystem. In this paper we highlight relationship between \textsc{Finesse}, how it used, provide an illustrative example has helped to better understand characteristics current generation gravitational wave interferometers.
Atom interferometers employing optical cavities to enhance the beam splitter pulses promise significant advances in science and technology, notably for future gravitational wave detectors. Long cavities, on scale of hundreds meters, have been proposed experiments aiming become demonstrators detection at frequencies below 1 Hz, where laser interferometers, such as LIGO, poor sensitivity. Our group Birmingham Institute Gravitational Wave Astronomy has explored fundamental limitations...